A choropleth map of world countries colored by primary balance, with a yellow legend panel for selecting economic categories. Clicking a legend item highlights matching countries and dims others; clicking again clears the selection. The map supports zoom and pan via d3.zoom. Built with d3.geoPath and geoEquirectangular projection, using TopoJSON world-atlas data and CSV attributes merged by ISO code. Hovering a country shows its name and primary balance in a tooltip.